Windisch, U. & Menzel, M. 2013. Software for determining the surface area of epiphytes. — Herzogia 26: 423–427.

Longterm monitoring of epiphytes uses the film method adopting a recommendation of the VDI-guideline 3957 Part 8. In the field the outer contours of individual thalli are traced on a transparency film. The film is digitalized by scanning and prepared for calculation of the surface areas of lichens and bryophytes. A newly developed software is introduced. Based on an example the steps of evaluation are shown. There is a listing of the functions that are new compared to a previous evaluation software.